Testosterone is to males what oestrogen is to females. This important male hormone is produced in the testes and the adrenal glands and is essential for normal sexual behaviour.  Testosterone also helps regulate your mood, your energy, it helps to build muscle and also to control your weight.

Furthermore, testosterone helps to build protein and assists with metabolic functions such as the production of blood cells in the bone marrow, bone formation, lipid metabolism, carbohydrate metabolism, liver function and prostate gland growth.